---
type: "concept"
title: "Imaginary unit"
slug: "imaginary-unit"
language: "en"
translationGroupId: "cmreyrnn30003ql013s5rd98o"
domain: "Algebra"
status: "stub"
aliases: []
lastEditedBy: "ancient-tree"
---

The imaginary unit $i$ is a number defined as $i^{2}=-1$.